I've installed gentoo 1.2 for ppc on my PowerBook G4.
Then i installed gnome. It tooks a LITTLE while to compile but, so far so god . Finally i've done a reboot, everything went normal until i have to login. The prompt appears correct, but the keybord seems to be frozen.
I haven't got a clue if this is related to the gnome installation, however it's they way that the problem shows up.

make sure that you have unselected the 'raw adb codes' option in your kernel configurtaion (which is on by default in ppc kernels), or pass as a yaboot arg "keyboard_sends_linux_keycodes=1" (no quotes).

from the mialing list:

Here is a copy of an email from an earlier thread (from Joe M):

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When you rebuild your kernel (and you probably want to, really), set
things up like this: